docs: def _long_query_encoded(self):
          """
          Returns the (uri_part, post_data_part) for a long query.
          """
          uristr = self._encode(omit_keys=True)
          kstr = "{}"
  
          klist = self._real_options.get('keys', UNSPEC)
          if klist != UNSPEC:
              kstr = '{{"keys":{0}}}'.format(klist)
  
          return (uristr, kstr)